Digging for future story writing? That's cool, I'll answer your questions anyway:
"Have you ever been sexually attracted to a guy?"
Only briefly at random points in the past, but they tended to have more feminine features. With dudes it was more of a curiosity while with chicks it's a lot more obvious of an attraction, especially a strong woman who knows what she wants and how to get it with strong emotions and passions. I don't feel as much as other people, but I do enjoy watching them experience things more vibrantly than I'm likely to.
"ever engaged in sexual activities with one?"
Not yet.
"if not, are you at least mildly curious about it?"
It's crossed my mind more than once, and with how I am about pain I am a little curious, but I tend to be more comfortable with women than men. There's something more awe inspiring about seeing a woman with power than seeing a man with it, especially during the learning curve steps of how to properly harm a person awakening a passion that the expectations of society might have otherwise left untapped. I'd be more likely to allow a woman to go at me with a strap-on than have sex with a man.
"would you ever give it a try or is it a definite no?"
It'd heavily depend on the guy and the context. I'm not really comfortable with it yet, but that lack of comfort could be from a lack of experience.
"What sort of sexual activity would you choose and how do you imagine it would go?"
I'd probably let him decide how things go if I were convinced to try that sort of thing, as I highly doubt it'd be me instigating it. I can't even imagine how it'd come to be.